# i find a bug in using /etc/init.d/mysql script to start percona5.5.20 **URL:** \ **Category:** Other MySQL® Questions\ **Created:** [February 21, 2012, 8:51pm UTC](https://forums.percona.com/t/i-find-a-bug-in-using-etc-init-d-mysql-script-to-start-percona5-5-20/1769 "2012-02-21T20:51:59Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![justlooks](https://avatars.discourse-cdn.com/v4/letter/j/e274bd/32.png) [@justlooks](https://forums.percona.com/u/justlooks)\ **Post date:** [February 21, 2012, 8:51pm UTC](https://forums.percona.com/t/i-find-a-bug-in-using-etc-init-d-mysql-script-to-start-percona5-5-20/1769/1 "2012-02-21T20:51:59Z")
i recently upgrade my DB from mysql5.0.77-log to percona server 5.5.20-55,when i start percona server,it seems the script have some problem the mysql is running ,i open performance schema,when i restart it… # service mysql restart MySQL (Percona Server) PID file could not be found! [FAILED] Starting MySQL (Percona Server)… . # ps -ef|grep mysql root 24648 24626 0 08:35 pts/1 00:00:00 mysql root 24836 24626 0 08:59 pts/1 00:00:00 vi mysqld-50 root 25743 1 0 10:23 pts/1 00:00:00 /bin/sh /usr/bin/mysqld\_safe --datadir=/var/lib/mysql --pid- file=/var/lib/mysql/mysqld.pid mysql 26330 25743 0 10:23 pts/1 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin- dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/err.log --pid-file=/var/lib/mysql/mysqld.pid – socket=/var/lib/mysql/mysql.sock --port=3306 root 26471 1 0 10:39 pts/1 00:00:00 /bin/sh /usr/bin/mysqld\_safe --datadir=/var/lib/mysql --pid- file=/var/lib/mysql/mysqld.pid mysql 27058 26471 1 10:39 pts/1 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin- dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/err.log --pid-file=/var/lib/mysql/mysqld.pid – socket=/var/lib/mysql/mysql.sock --port=3306 root 27134 24626 0 10:40 pts/1 00:00:00 grep mysql